From: Yajun Deng <yajun.deng@xxxxxxxxx> commit b37a466837393af72fe8bcb8f1436410f3f173f3 upstream. Add the case if dev is NULL in dev_{put, hold}, so the caller doesn't need to care whether dev is NULL or not. Signed-off-by: Yajun Deng <yajun.deng@xxxxxxxxx> Signed-off-by: David S. Miller <davem@xxxxxxxxxxxxx> Cc: Pavel Machek <pavel@xxxxxxx> Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> --- include/linux/netdevice.h | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-) --- a/include/linux/netdevice.h +++ b/include/linux/netdevice.h @@ -3378,7 +3378,8 @@ void netdev_run_todo(void); */ static inline void dev_put(struct net_device *dev) { - this_cpu_dec(*dev->pcpu_refcnt); + if (dev) + this_cpu_dec(*dev->pcpu_refcnt); } /** @@ -3389,7 +3390,8 @@ static inline void dev_put(struct net_de */ static inline void dev_hold(struct net_device *dev) { - this_cpu_inc(*dev->pcpu_refcnt); + if (dev) + this_cpu_inc(*dev->pcpu_refcnt); } /* Carrier loss detection, dial on demand. The functions netif_carrier_on